Last week I went to look at a 1985 Pickup for sale local to me. Seller mentioned he had a Marlin Crawler rebuilt replacement transmission "for a Supra". After a little poking around, I realized it was a Marlin Crawler R151F transmission and forward-shift transfer case. I was able to negotiate a fair deal, and the trans and t-case is now in my garage! Score!
the trans has the 3.83:1 1st gear and the forward shift t-case has stock 2.28:1 gears.
I'd like to run a dual transfer case in my project truck. My question is, what's the most efficient/economical way to build a dual case with what I have? I've read that it's best to run the 2.28:1 gears in the Crawl Box and run the 4.7:1 gears in the t-case. Plus my forward shift case needs to be in the Crawl Box, not the Transfer Case.
Should I just buy another RF1A top-shift core, 4.7:1 gears, MC08 adapter, and two rebuild kits? Then take apart my current T-case and convert it to a forward shift Crawl Box? And convert the core to a 4.7:1 top-shift t-case?
Or can I run 4.7:1 gears in the Crawl Box and 2.28:1 gears in the t-case since the R151F output is 23 spline? Then I would just need to convert the t-case to top shift instead of forward shift (and source a forward shift Crawl Box core)?
Or is it easier to just sell the rebuilt Marlin t-case and start from scratch?